La vie est un long fleuve tranquille (1988)

English title: Life Is a Long Quiet River.
Synopsis (with spoilers): Two babies from different social classes are switched at birth. Twelve years later the fact is revealed to both families, and they agree, after a monetary settlement, to let both children live with the rich family. The boy who had been raised in a poor environment slowly corrupts his rich siblings by putting them in contact with his former family; he also tells the whole truth to the girl with whom he was switched, making her feel bad and stop communicating with her rich non-biological family; the mother eventually has a nervous breakdown.
Appraisal: An interesting study on the effect of the environment on people; it is very cruel and unsentimental. The screenplay has a few loose ends, like the crimes against Arabs which are only mentioned in the beginning, or the doctor and the nurse who get a lot of screen time in the beginning of the film and then vanish (except for a brief appearance, as you will see). The film, even with these extraneous bits, clocks in at just 1h30, which means that there isn't a lot happening in its main thread of events. Still, it's quite an enjoyable film; its satire is mostly of an obvious kind, but is effectively conveyed and works quite well on a scene-by-scene basis; an uniformly perfect cast is one of its assets.
Rating: 63